greer



(No Model.)4 'ishets-Sheet 2.

L. B. GREER.

WRISTPIN TURNER. N.o. 258,053." Patented May 16, 1882.

` If/Www? live/zio?? N. PUERS, Pham'umegnpher. washington. mc,

(No Model.) 5, ,Sheets-Sheet 3.

L.B.GREBR.

WRIST PIN TQURNER.

No.,258,'053; Y Y Pafenfed May 16,' '1882...

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(No Modem 5 Sheets-Sheet 4'.

Y L.. B.. GREER.l

WRIST PIN TURNER.

No. 258,053.; Patenwted. May 16, 1882. R

(No Model.) I 5 Sheets-Sheet'. 5'. L. B. GREEK.

WRIST PIN TURNER. l N0. 258,053.. PRt-nted May 16, 1882.

N. paens. mmmhgmpner. washington, n, c.

PATENT t OFFICE.

LAUGHLIN B. GREER, OFIVVASH'INGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO CHARLES W. HAYES, CHAUNCEY F. GREER ALL or SAME PLAGE.

, AND "MARCUS G'TREER,

WRIST-PIN TURNER.

sPEcIFmATIoN forming `part of Letters' Patent Nol. 258,053, dated May 1e, 18812,

Application filed December 2S, 1881. (No model.)

l To all 'whom it may concern `Be it known that I, LAUGHLIN B. CREER, ofthe city and county of Washington, and

District ot' Columbia, have invented certain, Improvements in Wrist-Pin Turners; and I` hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part ot' this specification, in which- Figure lis an elevation ofthe end of the wrist-pin turner. Fig. 2 is a side elevation with a centering attachment on one end. Fig. 3 is a view of thc centering attachment. Fig. 4 is a longitudinal sectional View on the line a: .r ot' Fig. l. Fig. 5 is a vertical cross-section on the line y y of Fig. 2. Fig. Gis an end elevation, showing the sections ofthe wrist-pin turner separated.

My invention relates to wrist-pin turners, and is particularly designed for turning oft' and truing up the' ends ofshaftng, crankpins, and other` similar work without removing the work from its position. f

From time to time the bearing-surfaces of all heavy shafting and similar mechanical devices become irregular from unequal wear. 1t then becomes necessary to remove them from their positions and convey'them to a workshop provided with sufficiently heavy machinery to return the bearing-surfaces to a true cylindrical form. The removal and handling ofthe shaft ing or like devices is an exceedingly expensive and tedious operation, involving an expense enormous compared with the actual expense of the turning proper.

The object ot' my invention is to avoid all the expense ot' time, money, and trouble incident' to the removal of the class of work named to the shop, and to provide a meanswhcreby it can be successfully done without removing the work from its position.

Myinvention consistsin the combination and arrangement of parts, substantially as hereinafter more fully set forth and claimed.

In order that those skilled in the art may make and use my invention, I will proceed to describe the manner in which I have carried it out.

In the said drawings, A is a cylinder provided at its ends with boxes ct a, through the ends ot' which pass chuck-bars B B, approaching the center ofthe cylinder, and designed to hold the work. Tile position of the chuckbars is controlled by means of screws b b, having their end bearings in boxes b b.

Within the cylinder A is a tool-carrying cylinder, C, having bearings on friction-rollers d d. I provide one end ofthe cylinder C with a cogged ange, e, which meshes with a pinion, c', journaled in boxes on the end of cylinder A. Lengthwise of cylinder C, I casta table having a plane face on a chord ofthe arc, and locate within a groove,f, in it an endless screw, j", which carries a tool-carrie ge, D, which is of any ordinary construction, adapted to carry a cuttingtool, g. f 0n the end ot' the endless screw j where it projects from cylinder C is a sprocketwheel, h, the projecting arms ot' which are adapted to strike against any numberofscrew-pins,, projecting through cylinder 7o A in the line ot' its travel, as cylinder C is rotated by means ot power applied t0 turn pinion e. Any number of these pins may be applied through holes provided for the purpose, so as to increase or diminish the rapidity of feed, andthe extent to which the pins are made to project toward the center determines the amount ot' movement given the screw at each impact ot' the wheel against a pin.

In turning the end bearings oi'shafts,in order that the feed ot' the cutting-tool may be carried to' the extremeend ot" the work, I provide a removable centering-plate, P. (See Fig. 3.) This plate is circular, corresponding in diam. eter to the lwristpin turner, and is provided with slotted arms p p, projecting at right angles to it, whereby it is secured to the end ot' the wrist-pin turner by means ot` bolts p p. (See Fig. 2.) At its center plate P is tapped to receive a screw, S, provided with a jam-n ut, j, and a tapered or conical point. In placing work in position with this centering-plate the chuek-bars at one end ofthe lathe are made to grasp the shaft, and then the tapering end of screw S is forced into the center hole of the shaft and screwed up. The conical shape of the center hole and the tapering point of screw S force the axial line of the shaft or other work into a line identical with the axial line of the wrist-pin turner.

In very many instances shafting,` is solocalcd that the wrist-pin turner, so far described, could not, for the want of room, be passed over the end ofthe shaft. 'Io obviate this ditliculty I construct the cylinders A and C of two seetions each, (see Fig. 6,) and provide them with overlapping,` lugs n n 0 o', the. lugs n u on cylinder A projecting` outwardly, and the lugs o o on the cylinder() projecting inwardly, there being a pair of lugs at: each end or near each end of each cylinder.

In order to provide for wear the holes in the lugs from end to end of the cylinder taper to a slight degree, and the rod r, conneetingsaid lugs together, has a corresponding,` taper.

When the wrist-pin turner cannot be passed over the end of the shaft a rod, 1*, is withdrawn from the lugs, the.se1nicylinders are opened and clasped over the shaft at any desired position, and then keyed together. The wrist. pin turner is then ready for adjustment on the work.`

Having thus described my invention, what 25 I claim as new, and desire to secure by Letters Patent, is

In a wrist-pin turner, the outer cylinder, A, having arranged at intervals interiorly-projecting pins z', pinion e', and chuck-bars B, in conibination with the inner cylinder, C, having a circle ot' cogs, c, the endless screw f', provided with the sprocket-wheel h, the cutter-table D, having a cutter, g, and centering-bar P, substantially as set forth.

LAUGH LIN B. GREEK.

XVitncsses:

R. K. EVANS, e, WARREN PARSONS. 

